Apparatus for the production of artificial lithographic stones.



. J. WEZBL.

APPARATUS FOR THE PRODUCTION OF AETIPIOIAL LITHOGBAPHIG STONES.

APPLIOATION FILED JAN. 6, 190B.

Patented Apr, 6, 1909.

8 SHEETS-SHEET 1.

J. WEZEL. APPARATUS FOR THE PRODUCTION OI ARTIFICIAL LITHOGRAPHIO STONES.

APPLICATION-FILED JAN. 6, 1908.

Patented Apr. 6, 1909.

3 SHEETS-'BHBBT 2.

J. WEZEL. APPARATUS FOR THE PRODUCTION OF ARTIFICIAL LITHOGRAPHIO STONES. APPLICATION FILED JAN. 6. 190a.

mm f r V i 0 w M fl W A n e i z J m. 1: n.

a i v/ I To all who," it may concern:

' ducer guided by. hand, while the moving in opposite UNITED STA' 13 1ir rENT OFFICE.

JULIUS WEZEL, OF LElPZIG-STOTTERITS, GERMANY.

APPARATUS FOR THE PRODUCTION OF ARTIFICIAL LITHOG-RAPHIC STONES.

Application filed January 6, 1908. Serial No. 409,590.

Be it known that I, JULIUs WEZEL, a subject of the lerman Emperor, residing at Leipzig-Stottents, in Germany, have invented certain new and useful Improve-;

ments in Apparatus for the Production of Artificial Lit-hogra following is a specification.

The production of artificial lithographic stones by depositing a layer of lime on metal plates has hitherto been performed by hand,

a finely divided solution of lime being pro 'jected on to theplates from a spray-proheated by steam from below. When the solution impinges on the hot metal the water is immediately evaporated and a very thin layer of lime is deposited. This treatment is repeated .until the layer has acquired the necessary thickness. The success of the operation depends entirely care of the operator. cGreat diiliculty is found in producing a uniform layer. The cost of manufacture in this mamier is; high, since each plate must be separately treated by the operator. The process is also injurious to the health of the operator, who must inhale the ascending steam mixed with residual lime. The present invention obviates thes'c disadvantages. By treating the plates by means of mechanically controlled apparatus, the difiiculty relating to uniformit and the objection on hygienic grounr s, are at once removed.

According to the present invention, the metal plates are placed on a slowly moving band which conveys them through a cl1am her in which they are heated from below and s rinkled with atomized solution of lime rom above. The thickness of the layer deposited during one passage of the plates can be exactly regulated by regulating the speed of the band. As many plates as the chamber can contain may be simultaneously treated in the manner described. The workmen need not enter the chamber, but need only lace the plates on the band at one end and remove themat the other end. Continuity of action can be obtained by using two bands laced side by side and irections. A construction embodying the invention is shown in the annexed drawings. In this construction there are two bands moving in gpposite directions through the same chamer.

)hic-Stones, of which the plates are on the skill and Specification of Letters Patent.

: two parallel conveyers.

' lates.

Patented April 6, 1909.

Figure 1 is a longitudinal vertical section. Fi 2 a horizontal se C tlcal cross-sectiono'l' the bulldmg and apparatus. Figs. 4 and 5 show details of the conveyer band.

ction, and Fig. 3 a ver- The shed a, has "a steam-outlet b and comartments d (1, containing the- Elevated tanks f contain a solution of lime which can flow through pipes g to Sprayers or jets h, at which compressed air.

While the metal plates is are passing under the sprayers the said lates are heated from below by steam. It 1s of great importance that this steam does not reach the upper surfaces of the plates, since otherwise water would be deposited on said upper surfaces and would prevent the formationof a goo printing layer. make steam-tight 'oints between the plates and the walls of the heaters, and also between theindividual lates. The edges of the plates must not be argely overlapped by the devices which prevent the passage of steam, since, the parts covereddo not receive a deposit of lime, to utilize as much as possible of the area of each plate. Moreover, the said devices must be adjustable for plates of different sizes.

The metal platesk are conveyed through the compartments d by endless conveyors, each consisting of two parallel chains or bands at which pass over rollers n actuated by a ulley a. On detac able cross-bearers 0, there are placed, between troughs of uniform height, bearers. The troughs serve for steam-tig i llti joints between consecutive metal ent down as at ic at two sides, for the purpose of fixin the plates in the printing press, and these ient edges are placed in the troughs, and the latter su fii'ciently supplied with a suitable liquid that the edges of the lates are immersed. The troughs are adustable on the conveyer-bands,'.to suit plates of different sizes. At the sides of the metal plates 70, ti ht joints are made by means of slidable plates g which engage and pass for a short distance over the ed plates is, and are adgustable to suit p ates 7c of different widths. ther methods of making the joints can be used.

prises two comp and at intervals said bearers 0, parallel with the and it is of course desirable d 7 It is, therefore, necessary tov the bands m are placed making ed es of the metal plates are es of the It is, of course,of advantage if the metal plates are not screened at all from the spray, so that the entire upper surface of the metal can become coated with lime. The conveyer belts are carried by runners 1' which roll on rails s. veyer is a vessel t part containing a coiled steam pipe u which is partly immersed inthe water. The coils in the water serve to generate steam, and the I coils above the water dry the steam thus generated. Below the vessel t is a vessel 1:, well insulated from the steam generator. The em ty,-returning part of the conveyer passes through said'vessel c, which also contains water, and the troughs p are .by this a means re-filled. The conveyer extends beyond the spraying chamber at each end, so

that plates lc can'be placed thereon, and removed. At that end where the conveyer enters the chamber the conveyer is inclined so that the troughs p in rising from below the water level takes up a sufficient quantity of water to make a seal for the bent ends of the plates as aforesaid. The plates is are washed 9 after their passage through the said chamber, to remove therefrom the lime which does not firmly adhere. The operation is repeated uutil the coating is erfect. I

The spraying c amber is preferably made tight by means of pieces of cloth, rubber, or ot er packing w hung in front 'of the apertures through which the conveyers pass in and out. I .In the construction illustrated the Sprayers are distributed over the entire 0 amber. Preferably there are. no Sprayers close to the entrance aperture, so that the metal plates are thorou hly heated before the so ution is sprink ed thereon. The plates travel in opposite directions through the two compartments, and continue to travel backward and forward until the coat ing thereon has acquired sufficient thickness.

Hot water, steam,.hot air, electricity. or any other suitable means may be used for heating the plates. If dry, superheated steam or hot air is used, part of the heating agent may be admitted to the space above sprayed onto the upper surface of said plates the metal plates, in order to assist in rating the solvent.

What I claim as my invention and desire to secure by Letters Patent'of the United States is 1. A paratus for the production of artificial lit ogra hic stones, comprising in combination a .c amber, an endless conveyer extending through the chamber and proevapojecting beyond the same at both ends, adapt- I ed for the reception of metal plates, means for heatin the lower surface of said plates, a .series 0 nozzles through which liquid is Below the upper part of each cony' filled with water and i and means for imparting relative movement to the plates and nozzles. x 2. Apparatus for the production of artificial lithographic stones, comprising an end- -i less conveyer, ada ted for reception of metal plates, and capab e of movement in a horizontal plane, means forimparting heat to the i lower surfaces of said plates, a series of nozi zles through which li uid is sprayedonto the upper surface of said plates and means for securing tight joints between'the ends of adj acent plates.

3. Apparatus for the production of artificial lithographic stones, comprising a chamber, an endless conveyer adaptedfor the reception of metal plates, said belt traversing said chamber and extending beyond the ends. thereof, means for moving said belt slowly throughthe chamber in a horizontal plane, means for imparting heat to the lower surfaces of said plates, a series of ,nozzles through which liquid is sprayed onto the upper surfaces of said plates, means for securing ,tight joints between the ends "of adjacent plates, and means for securing tight joints I between the lateral surfaces of the plates and the walls ,of' the chamber.

4. Ap )aratus for the production of arti- 5 ficial lit hographic stones, comprising two endless convey'ers adapted for reception of metal plates, means for moving said plates in opposite directions, means fori'mparting heat to the lower surfaces of said plates, and a series of stationary nozzles through which liquid is sprayed onto the upper surfaces of the plates. 5'. Apparatus'for the productionof artificial lithographic stones, comprising a chamber, an endless conveyer adapted for the re ce tion of metal plates having bent rectangular ends, said belt traversing said chamber and extending beyond the ends thereof, cross-bearers on the conveyer for supporting the plates, liquid containing troughs carried by the conveyer for. reception of the bent ends of the plates, means for filling said I troughs, means for moving said'belt slowly through the chamber in a horizontal plane, meansfor generating steam for heating the lower surfaces of said plates, a series of nozzles through which liquid is sprayed onto the upper surfaces of said plates, and means for securing ti ht joints between the lateral surfaces of t e plates' and the walls of the chamber.

In witness whereof I have signed this specification in the presence of two witnesses.

JULIUS WEZEL.

Witnesses:

HERM. TAcK, ,RUDOLPH FRICKE. 

